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Transcript
Chapter 4 - Cell Structure and Function The printed out notes are more detailed than these slides, you are expected to read the chapter and your notes - anything is fair game on the test, but the cell chapter is largely review. Quick: Grab some scratch paper and quickly discuss with your partner what you remember from freshman biology about the cell. Early Contributions Hooke Leeuwenhoek Schleiden Schwann Virchow The Cell Theory 1. Every living organism is made of one or more cells. 2. The cell is the basic unit of structure and function. It is the smallest unit that can perform life functions. 3. All cells arise from preexisting cells. *Why is the Cell Theory called a Theory and not a Fact? Figure 4.3 Single Cheek Cell - at different illuminations ALL CELLS HAVE: 1. Cell Membrane Phospholipid Bilayer (double layer) 2. Genetic Material 3. Cytoplasm (cytos ol) ORGANELLES float within cytoplasm and perform specific functions Prokaryote vs Eukaryote Cells Endosymbiosis theory: *Mitochondria & Chloroplasts have their own DNA, and may have existed independently at one time Animation at Microbiological Concepts Prokaryote Cells Figure 4.4a Eukaryotes Quick Recap....... 1. What are the two main types of cells? 2. Which one is larger? 3. Which one does not have a membrane bound nucleus? 4. What are the three main parts of the cell (that all cells have)? 5. What are the 3 components of the cell theory? 6. What theory explains how eukaryotes evolved?